An external static ring axial compensation mechanism for mechanical seals

Abstract

The invention relates to an external stationary ring axle compensation mechanism for a mechanical sealing device. The external stationary ring axle compensation mechanism comprises a movable ring base which is installed in a sealing box and provided with a movable ring, a seal washer achieving floatation sealing and a first anti-rotating pin preventing rotation are arranged between the movable ring and the movable ring base. An external adjustable stationary ring axle compensation mechanism body is arranged on the outer end face of the sealing box. The external adjustable stationary ring axle compensation mechanism body comprises a gland arranged at the outer end of the sealing box, and the gland is connected with the outer end face of the sealing box through a bolt. An adjusting shim is arranged between the gland and the outer end face of the sealing box. Stationary ring compensation assemblies are evenly distributed in the circumferential direction of the outer end face of the sealing box. According to the structure, elastic components can be adjusted and replaced at will under the situation that the whole device is not dismounted, and the specific pressure of the sealing end face reaches a designed ideal value; and moreover, the concentricity and the following performance of the movable ring and the stationary ring are effectively guaranteed, the sealing effect is improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of mechanical seals, and more specifically relates to an external static ring axial compensation mechanism used on a mechanical seal device. Background technique [0002] At present, the pump shaft seal device of large dredgers at home and abroad adopts the L-shaped rubber pad seal device. Its working principle is that the static three L-shaped rubber pads and the rotating shaft sleeve dynamically rub against each other, and high pressure is provided between the L-shaped rubber pad seals. Clean water is used to lubricate and block the pumped medium, and the self-elasticity of the rubber and its attached spring are used to provide wear compensation to achieve the purpose of sealing. This kind of sealing device is suitable for a narrow range of working conditions, and its service life is unstable. The actual service life is mostly 1 to 6 months. It is affected by deflection, vibration, sharp particles and solid particle...

AI Technical Summary

Problems solved by technology

This kind of sealing device is suitable for a narrow range of working conditions, and its service life is unstable. The actual service life is mostly 1 to 6 months. It is affected by deflection, vibration, sharp particles and solid particle abrasion, marine organisms, and pump pressure conditions. As a result, the sealing effect is unstable, frequent eccentric wear and severe abrasive wear lead to a shortened service life of the system (the actual service life is mostly 1 to 6 months)

The maintenance and disassembly of large dredge pumps takes a lot of time and the cycle is long, which reduces the equipment utilization rate of dredge pumps, not only consumes a lot of maintenance funds, but also wastes a lot of precious construction time of dredgers

[0003] In the existing mechanical seal structure, the spring is a fixed and non-adjustable element after installation. However, due to the constraints of the pump body structure and installation dimensions on the special pump, the stability of the working height of the spring cannot be guaranteed. This instability directly Affects the spring specific pressure of the mechanical seal

The spring force mainly acts between the dynamic and static rings of the seal to prevent the sealing end face from opening when the equipment is started, stopped or the medium pressure fluctuates, so that the compensation ring can follow the end face and apply a closing force in the axial direction. The spring specific pressure is too small to play the above role, and vice versa Too large aggravates the wear of the seal ring, affecting the reliability and service life of the entire mechanical seal

[0004] Especially for split mechanical seals, the adjustment gap between the pump chamber and the impeller is large. When the mechanical seal is installed, the working height of the spring changes due to the adjustment of the impeller clearance of the pump, so that the specific pressure of the spring cannot obtain a stable design data, so it becomes a mechanical seal. A difficult point in the design of sealing structure

[0005] The prior art discloses a vibration-resistant mechanical seal for a large dredger with a secondary protection device, the publication number is CN201858359U. This type of mechanical seal has a built-in spring and cannot be adjusted

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